Diet selection by the lesser rhea (Rhea pennata pennata) in Payunia, Northern Patagonia (Mendoza, Argentina)

 

Autores
Puig, Silvia; Videla, Fernando; Cona, Monica Ines; Mendez, Eduardo
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2013
País
Argentina
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio
CONICET Digital (CONICET)
Descripción
The lesser rhea (family Rheidae) is a flightless large bird of South America, threatened due to habitat loss, hunting and egg collecting, with special concern in Northern Patagonia. Diet and food availability were estimated throughout the year by micro-histological analysis and point-quadrat transects in a landscape inside and another outside the Payunia Reserve, the northernmost part of the Rhea pennata pennata distribution. Significant differences were detected by Kruskall-Wallis ANOVA, food selection by Chi-square test and Bailey’s confidence interval. A strong food selection characterized the diet of lesser rheas, dominated by leaves of shrubs and forbs, complemented by dicot seeds and a few insects. This agrees with the documented low dietary overlap with other herbivores in Payunia. Dietary changes agree with the expected from the selective quality hypothesis. Food availability was better inside than outside the protected area, with probable conservation effects for lesser rheas. Seeds, forbs and soft grasses could be for lesser rheas some key food resources to survive during unfavorable seasons in arid environments without "mallines", as Payunia. Shrubby patches, with high availability of preferred food items (tall shrubs and forbs), stood out as key habitats. Therefore, avoiding fire and woody plant removal is crucial for the conservation of lesser rheas in the northern of its range.
Idioma
inglés
OAI Identifier
oai:ri.conicet.gov.ar:11336/18399
Enlace del recurso
http://hdl.handle.net/11336/18399
Nivel de acceso
Acceso abierto
Materia
ARID ENVIRONMENTS
DIET COMPOSITION
FOOD AVAILABILITY
FEEDING ECOLOGY
AMBIENTES ARIDOS
COMPOSICION DIETARIA
DISPONIBILIDAD ALIMENTARIA
ECOLOGIA ALIMENTARIA
Ecología
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS